Large eddy simulations of the turbine vane pressure side film cooling flows of cylindrical and fan-shaped holes with a saw-tooth plasma actuator

IF 6.1 2区工程技术 Q2 ENERGY & FUELS Applied Thermal Engineering Pub Date : 2024-09-13 DOI:10.1016/j.applthermaleng.2024.124404

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Abstract

Large eddy simulations were conducted to study the film cooling performance of turbine pressure side with cylindrical hole, fan-shaped hole and saw tooth plasma actuator (STPA). A detailed analysis of the time-averaged film cooling flows was made. The results showed that the dual control effects of the combined design of the fan-shaped hole with the STPA reduced the exit momentum and blowing off effect of the jet flow, remaining the jet flow close to the pressure side. The combined design also effectively weakened the entrainment effects of counter rotating vortex pair (CRVP) and enlarged cooling film coverage. Therefore, the spanwise averaged cooling efficiency was improved more than 30% in comparison to the cylindrical hole, but the fan-shaped hole caused a 23.9% increase in aerodynamic loss, and the STPA had few additional aerodynamic losses. Subsequently, the instantaneous film cooling flows were analyzed, the combined design suppressed the evolution processes of the vortex rings in the near-hole region, and the coherent structures in the far downstream region were decreased in size, affecting the mixing process of coolant and gases. The CRVPs were noticeably elongated along the pressure side and moved downstream periodically over time. The present study highlighted the superiority of the combined design to improve the turbine vane cooling performance.

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使用锯齿等离子体致动器对圆柱形和扇形孔的涡轮叶片压力侧膜冷却流进行大涡流模拟

对带有圆柱孔、扇形孔和锯齿等离子致动器（STPA）的涡轮机压力侧薄膜冷却性能进行了大涡流模拟研究。对时间平均薄膜冷却流进行了详细分析。结果表明，扇形孔与 STPA 组合设计的双重控制效果降低了喷射流的出口动量和吹脱效应，使喷射流保持靠近压力侧。该组合设计还有效削弱了反向旋转涡对（CRVP）的夹带效应，扩大了冷却膜覆盖范围。因此，与圆柱孔相比，跨向平均冷却效率提高了 30% 以上，但扇形孔造成的气动损失增加了 23.9%，而 STPA 几乎没有额外的气动损失。随后，对瞬时薄膜冷却流进行了分析，组合设计抑制了近孔区涡环的演化过程，远下游区的相干结构尺寸减小，影响了冷却剂和气体的混合过程。CRVP 沿压力侧明显拉长，并随时间周期性地向下游移动。本研究强调了组合设计在改善涡轮叶片冷却性能方面的优越性。

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来源期刊

Applied Thermal Engineering 工程技术-工程：机械

CiteScore

11.30

自引率

15.60%

发文量

1474

审稿时长

57 days

期刊介绍： Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.